DRM framework support:
- add a sniffer for DRM files
- add DRMSource and DRMExtractor for es_based DRM
- add pread in FileSource.cpp for container_based DRM
- add native DRM framework API calls in the player for
  DRM audio/video playback

Change-Id: I4b9ef19165c9b4f44ff40eeededb9a665e78a90f
diff --git a/media/libstagefright/DataSource.cpp b/media/libstagefright/DataSource.cpp
index a66f86b..d7dd4e5 100644
--- a/media/libstagefright/DataSource.cpp
+++ b/media/libstagefright/DataSource.cpp
@@ -19,6 +19,7 @@
 #include "include/MPEG4Extractor.h"
 #include "include/WAVExtractor.h"
 #include "include/OggExtractor.h"
+#include "include/DRMExtractor.h"
 
 #include <media/stagefright/CachingDataSource.h>
 #include <media/stagefright/DataSource.h>
@@ -94,6 +95,7 @@
     RegisterSniffer(SniffAMR);
     RegisterSniffer(SniffWAV);
     RegisterSniffer(SniffOgg);
+    RegisterSniffer(SniffDRM);
 }
 
 // static